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From "Vijay (JIRA)" <>
Subject [jira] [Comment Edited] (CASSANDRA-4876) Make bloom filters optional by default for LCS
Date Thu, 01 Nov 2012 08:19:12 GMT


Vijay edited comment on CASSANDRA-4876 at 11/1/12 8:18 AM:

Plz ignore my previous comment, +1
      was (Author:
    Hi Jonathan, Looks like there is a bug in, when getBloomFilterFpChance
return 1.0 we might not store or use BF at all... it should have been > 0.01 right? same
with line #450 not sure i am misreading the patch.
> Make bloom filters optional by default for LCS
> ----------------------------------------------
>                 Key: CASSANDRA-4876
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>            Priority: Minor
>             Fix For: 1.2.0
> Since LCS gives us only 10% chance we will need to merge data from multiple sstables,
bloom filters are a waste of memory (unless you have a workload where you request lots of
keys that don't exist).

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